Heating-can.



P. FRIEDMAN & A. H. CARLISLE.

W t n w an aucun-m3 PATENTED AUG. 6, 1907.

P. FRIEDMAN & A. H. CARLISLE.

HEATING GAN.

APPLIOATION FILED NOY- 25, 1905.

3 SHEETS-SHEET 2.

am www 9L @Mij/M64 aus.,

No. 862,151. PAT-ENTED AUG. 6, 1907. P. PRIEDMAN & A. H. CARLISLE.

HEATING CAN.

APPLICATION FILED Nov. z5, 1905.

' a SHEETS-SHEET s.

I l @Hainaut TTNTTEE sTATEs PATENT OEETOE.

PAUL ERIEDMAN AND ALBERT HAREORD CARLISLE OE NEW YORK, N. Y., AssIGNoRs To THE AETNA sELE HEATING FOOD COMPANY, OE JERsEYoITY, NEW JERSEY, A CORPO- RATION OF NEW JERSEY.

HEATING-CAN.

Patented Aug. s, 1907.

Appucation sie@ November 25,1905. serial No. 289,058.

To all 'whom it 'may concern:

Be it known that we, PAUL FRIEDMAN, a subject of the Emperor oi Germany, and ALBERT HARFORD CAR- LISLE, a citizen ol the United States, both residing at New York, in the county of New York and State ofNew York, have invented new and useful Improvements in Heating-Cans, oi which the following is a specification.

Our invention relates to self-heating cans for use in connection with canned foods and its object is to provide acan suitable for heating or cooking the food contained therein without the application oi external heat, and of such construction that it may -be easily and cheaply manufactured and may be readily disrupted to permit the mixture oi the elements O the heating compound. I

Our invention relates to the heating of the food in the can by means of the heating reaction due to the introduction of water into a suitable chemical placedin a chamber adjoining the lood receptacle.

There have been various attempts to use 'for selflleating purposes, the heating properties of various chemicals, when brought in contact with water, but up to the present time, so lar as we are aware, the only device adapted to carrying out this use has been that of a can or receptacle havingr a double bottom or separate chamber containing the water when the can is sold, and having a chemical containing chamber separated by the metal wall of the chambers from the water, which wall must be pierced or disrupted by a metal punch or similar device to establish communication between the chambers. The evident objections to such a construction are that unless the water chamber is absolutely water-tight the chemical action will be set up prematurely, with the result that when necessary to use the can the heating element Will have-been exhausted;A

while if the water chamber is made. absolutely watertight, the cost of manufacture and the necessary examination and tests make the expense practically prohibitive. In addition, the user of the device is obliged to force an opening through the sheet-metal to allow the water to reach the chemical, which requires considerable effort and is awkward and inconvenient and calls for the use of a special cutting or piercing instrument capable of penetrating the entire thickness of the metal of the can.

Our invention aims to overcome these objections and to this end it is embodied, in preferable form, in the device shown in the accompanying drawings and hereinafter described.

In these drawings, Figurel is a central vertical section of our improved can, and Fig. 2 is a plan view of the bottom end of the can shownv in Fig. l; Fig. 3 is a basin 91.

view similar to Fig. 2, showing a modified form of frangible division and closure wall. Fig. 4, is a central vertical section of another modified form of can and l Fig. 5, a vertical section of a can showing the closure of Fig. 3, applied thereto.

Referring to the drawings and particularly to the can illustrated in Figs. 1 and 2, the food is contained in a food chamber formed preferably by an ordinary sheetmetal can or vessel l, which is adapted to be placed within an outer can body or vessel 2. The outer can body has at one end a cover rim 3 and the food can fits within this rim and is soldered thereto.

The space between the wall ofthe food chamber and the wall of the outer can-body 2 forms a chamber 4, adapted to contain a suitable chemical which when mixed with Water will set up a reaction and produce a heat sufficient to cook or heat the contents of the adjoining iood chamber. Preferably calcium oxid(CaO) is employed, but any other chemical suitable for this purpose may be employed.

yA closure for one end of the chemical receiving chamber, is secured within the outer can-body solne distance from the end and thereby serves to divide said can-body into an open, exterior water retaining basin 9I and an inclosed chemical'chamber 4 formed by said closure, the walls ofthe ood can and Outer can-body and the other end ofthe can. This closure is provided with exposed frangible portions over the chemical containing chamber which may be readily disrupted to permit water to enter said chamber from the basin, so as to set up a heating re-aetion therein.-

In the can of Figs.' 1 and 2, the closure consists of a sheet metal disk 5provided at intervals with annularly disposed holes 6, over the chamber 4 and of a lining or covering of paper 7 or other suitable frangible material, which is pasted or otherwise secured on the inner surface of the sheet-metal cover member, covering the holes G and serving to prevent the escape of the chemical therethrough.`

In the practical construction oi the device, the cover Vmember 5 is preferably made With-an integral annular' vertical flange 8, and this cover member is adapted to be slipped within the can-.body 2, its Hangs 8 and the portion of the outer can-body extending beyond the chamber 4, constituting the Wall of the external water l Such construction affords a convenient mode of forming the closure 4for the chemical containing` chamber and the Water retaining portion of the basin'. This ange also serves to` provide a desirable means of holding the closure within the canbody and also serves to strengthen the Walls of the basin and to provide a rounded edge for the end of the can where it is turned over the can-body and soldered thereto.

able and ordinary Way oi opening thecan topmay be Lio . ing until the Water has been absorbed by the chern- A groove 9 may beformcd the canbody into which the metal cover member may be sprung. This 'cover membermay also be crowned or raised at the central portion 10, so as to cause the water placed in the recepvtacle to flow over into the openings 6.

generates sufiicient heat to thoroughly heat the foodf contents 'of the can. After the can has been left standical, the can is turned top end upyandv permitted to stand a 'ew minutes longer until the contents of the can have heated sufficiently. `The upper end of the fovod can is then'opened'and'the food removed. To

provide for the ready opening oi the food can, the end to be opened is preferably formed with a tearing strip 10E such as are 4commonly employed on sardine cans, and which are adapted to'bc removed by the twisting action 'of a key engaging the`strip,\ but any other. suitused.

In Figs. 3 and 5 there is shown a modified -ormof lcan in which the closure for the chemical chamber, which divides said chamber from the water basin, consists merely oi the sheet metal cover disk ll'uand the frangible portions of the closure are provided by Weak-. ened portions 12 in the metal formed by crossed scores or'. cuts which partially "pierce lthe'metal, or similar means reducing vthe resistance'o the-metal andy which render itpossible for the disk to befreadily disrupted and an pe'ningieffected by the pressure of some suit-y able-means like the end of a key, the point of a knife 4or similar instrument. These weakened portions are annularly arranged, and located 'over the chemical containing chamber. In-,tliis form of-4 can the inside ,l paper cover is dispensed Wi h.' .The cover disk 1 1 has an vannular flange 12'1 engagingy the outer canwbody.

In Fig. 4, there is illustrated a orm of can in which vthe openings from the Water receptacle to the chemi sisting of an annulus 14 having a ange 15 is sprung ical .chamber and the opening end dof the food chamber are at the same end of the can whereby there is no necessity of turning the can bottom. end up to introduce the Water into the chemical.. In this form ofthe can an inner food can or"` receptacle 13 is continued out lto anevenheight with the end of the Wall of theiouter can bodyy 14. Between these-two walls a closure conandsoldered into place, and thereby forms a Water receptacle 16, surrounding the endoi the iood chamber that is to be opened. lThis annulus .is provided With weakened portions 17, over .the chemical contain- 1 ing chamber and which are adapted to be opened to admit the water as in the case of the forms previously described, The weakened portions may either be i ermed by the open holes in the sheet-metal, covered by the paper covering as set forth with respect to thel .can ofkFigs. 1 and 2, or they may be formed according tothe mode employed in the device of Fig. 3, and it' is the latter form that is particularly sho-wn in this singie-ended can oi Fig. 4. y l h A' can constructed in accordance with the foregoing specification can be easily and cheaply manufactured and be readily opened without the aid, ol". special appliances. I

lt is clear that various changes in the details oi Ithe device illustrated and described herein may be made Without departing frein the principle of ,our invention.

Having thus described ourl invention, what We claim is:

1. A heating can having an inner `food-containing canbody, an outer 'can-body spaced therefrom, said can having a chemical containing chamber and an open exterior \vater retaining basin, said chamber and ba 'n beingseparated by an hnnular closure for the end of he chamber which closure 'is placed ashort distance within `the open end off the outerican-body and forms the bottom of the basin, and is provided with exposed frangible portions annularly disposed over the chamber, whereby the closure may be readily disrupted to permit water poured into the basin to passl t'o the saidchamber, substantially as described.

2. A heating can having an'V inner food containing canbody, an outer can-body spaced therefrom, and means, havingl exposed `iranglble portions, for separating the space within the louter can-body and cxteriorl to the inner canbody into a chemical-receiving chamber `and an open, water-receiving basirifsubstantially as described.

3. A heating 'can having an inner food containing canbody, an outer can-body spacedatherefrom, a sheet-metal cover member near one end ofv said outer can-body dividing sai canbody into n chamber adapted to contain a chemicnland an open basin adapted to receive Water, -snid cover member having exposed weakened, poi-tio s in the metal thereof, annularly disposed, over the che ical containing chamber whereby the said cover member may be disrupted to admit water to said chamber, substantially :is described.

4. A heating can having an inner food containing canbody, an outer can body spaced therefrom to form a chemical containing chamber Aand means to close the end of said outer can-body said means having frangible portions which may be broken to `admit water into the can-body and com` prsing a sheet-metal member tting within the outer canbody a short.. distance from the end thereof, said member having a pei'pendicular flange, engaging said outer can` body, vihereby an Jopen Water receptacle is formed, substantially as deseribed.

A heatingA can having an inner food-containing" ennbody, an outer can-body spaced therefrom, to form achem- 'ical containing. chamber a sheet'metal member fittingwithin the outer can-body and having an inner annular disk portion extending across said space and :1n-integral flange perpendicular lto the dis-k, snid"flange having its end turned over andsecured to the end of the outer canbody, whereby an open water receiving basin with a doub e wall and rounded edge is provided, means in the ann-u ar portion, normally closed, whereby openings from the basin to the chamber may be readily formed, substantially as described.

(i. A heating can having an 4inner`fo0d containing canbody an outer can-body separated from the innercan-body py an annular space forming a chemical containing chamer, a 'cover member for said outer cambody having rangible portions, a groove in said outer can-body adapted to lengage saidcover, said cover member having an annular vertical flange' forming a` water retainingfwall and said ange turned over the edge of the outer can-body, substantially as described. A

In testimony whereof We aiirour signatures, in presence of two subscribing witnesses.

PAUL FRIEDMAN. ALBERT HARFORD CARLI-SLE.

Witnesses:

'l'noMAs ALLEN, 3d,

HENRY SlLLcOCKS. 

